Nexperia USA Inc. 74LVTH125DB,118

Overview

74LVTH125DB,118 from Nexperia is a 3.3 V quad non-inverting 3-state buffer with bus-hold inputs and IOFF partial power-down protection, delivering ±32 mA/±64 mA output drive, 2.7–3.6 V supply operation, and 5.5 V overvoltage-tolerant inputs. It serves as a level-translating bus interface in high-speed digital systems such as industrial control backplanes and FPGA I/O expansion.

For engineers reviewing the 74LVTH125DB,118 datasheet, 74LVTH125DB,118 pinout, 74LVTH125DB,118 application, or 74LVTH125DB,118 equivalent, key selection criteria include 3-state timing (tPZH ≤ 4.7 ns), bus-hold current (IBHL = 75–150 μA), IOFF leakage (< ±100 μA at VCC = 0 V), and SO14 package compatibility with legacy 74-series footprints.

Technical Context

This BiCMOS device implements four independent non-inverting buffers, each controlled by an active-low 3-state enable input (nOE). Its bus-hold circuitry maintains valid logic states on unused inputs without external pull-ups, while the IOFF feature disables outputs during power-down to prevent backflow current.

It supports live insertion/extraction and direct TTL-level interfacing, with overvoltage-tolerant inputs rated to 5.5 V-enabling safe connection to 5 V buses while operating from a 3.3 V supply. Propagation delays are specified down to 1.0 ns (typ) for both L→H and H→L transitions at VCC = 3.3 V.

Key Specifications

Pinout & Package

74LVTH125DB,118 is packaged in SO14 (SOT108-1): plastic small outline, 14-lead, 3.9 mm body width, with standard 1.27 mm lead pitch and pin 1 index marker.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad 3-state buffer applications.

Compared with SN74LVC125APWR and 74ALVC125MTCX, the 74LVTH125DB,118 uniquely combines 5.5 V input tolerance, IOFF protection, and bus-hold in a single SO14 package-making it the only option qualified for mixed-voltage, hot-pluggable industrial backplanes.

Availability

74LVTH125DB,118 is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA I/O expansion, legacy system upgrades, and test equipment signal conditioning requiring stable component supply, long-term lifecycle assurance, and SO14 footprint compatibility.

Supply support for 74LVTH125DB,118 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert specializing in high-performance, reliable logic, analog, and MOSFET solutions for automotive, industrial, and consumer markets.

The 74LVTH series targets high-speed, mixed-voltage digital interfacing applications where robustness, bus integrity, and power-down safety are critical-particularly in programmable logic and modular control systems.

FAQ

Can 74LVTH125DB,118 safely interface with 5 V logic while powered from 3.3 V?

Yes. Its inputs are overvoltage-tolerant up to 5.5 V regardless of VCC level, allowing direct connection to 5 V buses without level shifters. This is verified in Table 5 (VI = 0 to 5.5 V) and Table 4 (VI max = +7.0 V absolute limit), making it ideal for upgrading legacy 5 V systems with modern 3.3 V controllers.

Does 74LVTH125DB,118 support hot-plug insertion in live backplanes?

Yes. The IOFF circuitry actively disables outputs and limits leakage to ±100 μA when VCC = 0 V, preventing damaging back-current from 5 V bus lines into the unpowered IC. This is explicitly validated in Table 4 (IOFF specification) and Section 1 (partial power-down description).

What is the purpose of bus-hold inputs, and how do they affect design?

Bus-hold circuitry maintains the last-valid logic state on unused inputs using ~100 μA feedback current (IBHL/IBHH), eliminating the need for external 10–100 kΩ pull resistors. This reduces BOM cost, saves PCB area, and avoids weak pull conflicts in multi-driver configurations.

How does the 74LVTH125DB,118 differ from the standard 74LVT125 variant?

The 'H' suffix denotes enhanced features: higher output drive (+64 mA/–32 mA vs. +32 mA/–24 mA), improved bus-hold strength (IBHL = 75–150 μA vs. typical 50 μA), and tighter timing specs (tPLH/tPHL typ = 2.7/2.9 ns at 3.3 V). These improvements are documented in Sections 2 and 10 of the datasheet.